Jump to main content
Jump to site search

Issue 32, 2017
Previous Article Next Article

The origin of bisignate circularly polarized luminescence (CPL) spectra from chiral polymer aggregates and molecular camphor: anti-Kasha's rule revealed by CPL excitation (CPLE) spectra

Author affiliations

Abstract

The first circularly polarized luminescence (CPL) excitation (CPLE) measurements of poly(fluorene-alt-bithiophene) (PF8T2) aggregates with bisignate CPL/circular dichroism (CD) signals and, for comparison, bisignate CPL signal camphor were achieved. Based on this finding, we propose that Kasha's rule can be broken in chiral luminophore systems. The |gem| values of PF8T2 hetero-aggregate with help of helical polysilanes (PSi-S/-R) as sacrificial scaffoldings boosted to 0.05–0.08 at ≈510 and ≈540 nm associated with a high quantum yield of 0.33. The gem values arose from hugely amplified |gabs| values of 0.15–0.25 at ≈500 nm and ≈510 nm. Moreover, PF8T2 homo-aggregate, maintaining the bisignate CPL and CD spectral profiles, was generated by PSi-S/-R selective photoscissoring reaction at 313 nm for 10 s.

Graphical abstract: The origin of bisignate circularly polarized luminescence (CPL) spectra from chiral polymer aggregates and molecular camphor: anti-Kasha's rule revealed by CPL excitation (CPLE) spectra

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Jun 2017, accepted on 16 Jul 2017 and first published on 17 Jul 2017


Article type: Paper
DOI: 10.1039/C7PY00958E
Citation: Polym. Chem., 2017,8, 4673-4679
  •   Request permissions

    The origin of bisignate circularly polarized luminescence (CPL) spectra from chiral polymer aggregates and molecular camphor: anti-Kasha's rule revealed by CPL excitation (CPLE) spectra

    S. T. Duong and M. Fujiki, Polym. Chem., 2017, 8, 4673
    DOI: 10.1039/C7PY00958E

Search articles by author

Spotlight

Advertisements